The league is holding its annual gathering of executives, coaches and player hopefuls here, and 29 of the 30 NBA teams are wondering about their chances this upcoming season and why the Warriors are the Chosen Ones.

Meanwhile, the Warriors, winners of three of the last four championships, are no doubt doing some head-scratching about how a key injury is once again helping their cause and making them stronger.

This is about luck, then, and why those chasing the Warriors can’t seem to get a break, and how the Warriors managed to make themselves both good and lucky.

There is considerable buzz among the basketball throng in Vegas regarding the Warriors, who are less than a month removed from a convincing sweep of LeBron James and the Cavaliers in the NBA Finals and how they won twice this summer: championship and then free agency. The collective moan from the rest of the NBA seems to say: What the hell?

How dangerous are the Warriors with DeMarcus Cousins aboard?

DeMarcus Cousins agreed to a one-year deal with the Warriors for the NBA equivalent of loose change in a sofa: $5.3 million. Just like that, the Warriors added a dominant and versatile center, maybe the best in the game, which made coach Steve Kerr wisecrack about how the Warriors “needed another All-Star.”

This was made possible because of a quirky circumstance that caused Cousins a lot of pain, which translated into plenty of gain for Golden State. When Cousins tore his Achilles last spring with the Pelicans, his market value in free agency fell to the floor right along with him. Suddenly, the rest of the league, including the Pelicans, became wary about investing heavily in a hulking center who most certainly would need most of the 2018-19 season to rehab, without any guarantee Cousins would return to form once medically cleared to play.

Cousins averaged 25.2 points, 12.9 rebounds, 5.4 assists and 1.6 blocks last season, perhaps the best of his career. He turns 28 in late August. Had he avoided injury, he would’ve been far too expensive for the Warriors to afford. They’re well over the luxury tax and are limited to exceptions, which allow them to sign players but only on the cheap. A healthy Cousins was destined to command in excess of $20 million a season, more had he stayed with the Pelicans.

“If he’s healthy, he’s the best player at his position in the league,” said Pelicans coach Alvin Gentry.

Well, when free agency opened, Cousins’ phone didn’t ring, and you probably know the story by now: He personally called the Warriors and signed up on the spot. His reasoning: If my only choice in this league is a short-term deal, might as well be with the team in the midst of a dynasty.

The Warriors understandably were shocked, but why would they be? This isn’t the first time an injury went their way.

Marc Spears explains how DeMarcus Cousins wound up with the Warriors.

Steph Curry’s chronic ankle sprains once threatened his career. He underwent surgery in the summer of 2011 and played only 26 games the next season. At that time, Curry was a good player, but far from the superstar who’d win a pair of MVPs and destroy 3-point shooting records.

So the Warriors were understandably worried, especially once Curry was due a contract extension. The two sides made a compromise that protected both parties: Four years, $44 million. The risk the Warriors took is Curry would continue having ankle issues and never see a full season.

Curry’s risk: He’d remain healthy and see his production swell and spend most of that contract as a bargain.

A bargain, for sure: At the end of that deal, Curry was the fourth-highest-paid player. On his own team.

The upside for the Warriors and Curry: That contract helped them extend Draymond Green, Klay Thompson and Andre Iguodala and more importantly, add Kevin Durant.

When you’re good and lucky — remember, the Warriors won their first title over the Cavs when Cleveland was largely without Kyrie Irving and Kevin Love, and beat the Rockets last spring after Chris Paul suffered a series-ending hamstring injury — then you get plenty of rings.

The beauty of the Cousins situation is the Warriors don’t need him during the regular season. This was mentioned more than a few times by rival general managers and coaches in Vegas. Cousins’ rehab is expected to require another five or six months — full recovery form Achilles surgery is usually a year — yet there’s no rush. Golden State won 73 games a few years ago without him and won 58 games last season on cruise control.

They can wait until next spring, where Cousins could return, say, in March and use the final few weeks as a warm-up for the playoffs. After using the likes of the plodding Zaza Pachulia and quirky JaVale McGee in the middle, the Warriors are legit at center. Cousins fits the Warriors’ style because he can shoot 3s and is a willing and efficient passer from the high and low post.

“That’s really an area where they’ve struggled and been inconsistent,” said Gentry, a former Warriors assistant coach before taking the top job in New Orleans. “It’s going to be a position where they make an upgrade.”

The Lakers welcome LeBron, but they didn’t get Paul George, who stayed in Oklahoma City, and the idea of trading for Kawhi Leonard this season remains a fantasy, at least for now.

Which means the Warriors are once again the odds on favorites across town in the Vegas casinos to sip champagne next June.

“Hey, that’s the NBA,” said Gentry with a shrug. “It’s supposed to be that way. You’re supposed to put out the best team you can. It’s up to the rest of us to catch them. They’ve put together a great team, drafted great, and guys in free agency wanted to come there. That’s what it’s all about. We have to pick up our game, it’s not that they should say, ‘Oh we’re too good, let’s give away players.’ We all have to find a way to catch them, not them coming back to us.”

Damian Lillard, the star guard for the Trail Blazers, spoke for the field when he said: “It’s just going to get tougher and tougher. It is what it’s always been, but just a little tougher. But you know what? Once the season starts, we gotta go. Nobody’s got time to be out there, not having fun and being stressed and all that BS. We gotta find to make it happen.”

Twenty-nine teams, and especially the contenders in the West, are at a disadvantage regarding the Warriors because of a lack of All-Stars; not only do the Warriors now have five, but they’re all in their prime years.

It’s one thing to try to be as good as the Warriors. Nowadays, you must rise to their level of luck as well.

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Veteran NBA writer Shaun Powell has worked for newspapers and other publications for more than 25 years. You can e-mail him here, findhis archive hereand follow him on Twitter.

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